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Related Concept Videos

Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or...
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A digital microfluidic electrochemical immunoassay.

Mohtashim H Shamsi1, Kihwan Choi, Alphonsus H C Ng

  • 1Department of Chemistry, University of Toronto, 80 St George St., Toronto, ON M5S 3H6, Canada. aaron.wheeler@utoronto.ca.

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This summary is machine-generated.

This study presents the first digital microfluidic immunoassay using electrochemical detection for thyroid stimulating hormone (TSH). This novel approach offers a sensitive and portable method for diagnostic biomarker analysis.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biosensing

Background:

  • Digital microfluidics (DMF) is widely used for quantitative immunoassays.
  • Existing DMF immunoassays predominantly use optical detection methods.
  • There is a need for alternative detection methods in DMF for broader diagnostic applications.

Purpose of the Study:

  • To develop and validate the first digital microfluidic immunoassay utilizing electrochemical detection.
  • To demonstrate the feasibility of using electrochemical detection for quantifying diagnostic biomarkers on a DMF platform.
  • To assess the performance of this novel immunoassay for thyroid stimulating hormone (TSH) detection.

Main Methods:

  • Modification of an indium tin oxide (ITO) based DMF top plate with gold sensing and silver electrodes.
  • Development of a TSH immunoassay using magnetic microparticles, primary (Ab1) and secondary (Ab2) antibodies.
  • Conjugation of the secondary antibody with horseradish peroxidase (HRP) for signal amplification.
  • Amperometric detection of HRP-catalyzed oxidation of 3,3',5,5'-tetramethylbenzidine (TMB).

Main Results:

  • Successful implementation of an electrochemical detection system within a digital microfluidic platform.
  • Quantification of TSH with a limit of detection of 2.4 μIU mL(-1), suitable for clinical diagnostics.
  • Demonstration of a simplified and miniaturized immunoassay system.

Conclusions:

  • The developed digital microfluidic immunoassay with electrochemical detection is a viable alternative to optical methods.
  • The system exhibits clinical compatibility for TSH measurement.
  • The platform's simplicity and small size indicate potential for future portable diagnostic devices.